Abstract

This paper presents the seal material mixing ratio of tunnel umbrella arch reinforcementmethod. Currently, there is no clear standard for the proper gelation time and curingtime of the Seal material in Korea, and the quality control is also difficult because itcannot be verified. In response, the ratio of the mixture of the seal material wascomposed of four types of indoor experiments, and the amount of gelation time andbleed was checked. In addition, a non-cart penetration test confirmed the curing timeand compared the ratio of each combination. Further experiments on W/C 120%identified the effect of mixing speed and time on the seal material. A total of three fieldexperiments were conducted based on indoor experiments, and the size and strength ofbulb formation were compared by checking the curing time of the specimen and maininjection. Comparisons show that the lower W/C, the stronger the strength, the largerthe size of the bulb, and the faster the hardening time appears. Based on the results ofthe gelation time and curing time, it was deemed that the mixing ratio of W/C 120%is most appropriate when applied to the actual site.